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(No Model.) 2 Sheets-Sheet 1,

J. F. DURHAM.

.PURNAGE.

No. 397,174. Patented Feb. 5, 1889.

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Patented Feb. 5, 1889.

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JOHN F. DURIIAB'I, OF DETROIT, MICHIGAN, ASSIGNOR OF ONE-HALF TO JOHNSCHUI-IOLZ, OF SAME PLACE.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 397,174, dated February5, 1889.

Application filed August 2, 1888i To all whom it may concern.-

Be it known that I, JOHN F. DURHAM, a citizen of the United States,residing at Detroit, in the county of IVayne and State of Michigan, haveinvented certain new and usoful Improvements in Furnaces, of which thefollowing is a specification, reference being had therein to theaccompanying drawings.

This invention relates to a new and useful improvement in hot-airfurnaces for heating buildings; and the invention consists in thepeculiar construction, arrangement, and combination of the differentparts, all as more fully hereinafter described, and shown in thedrawings, in which- Figure 1 is a longitudinal vertical central section.Fig. 2 is a cross-section on line w it in Fig. 1. Fig; 3 is a horizontalsection 011 line y y in Fig. 1. Fig. 4; is a similar horizontal sectionon line 2 2. Fig. 5 is a longitudinal section on line '20 in Fig. 2.

A is a steam-generator of known construction and set in ln'ick-work inthe usual manner.

B is the furnace of the steaiii-generator.

C are smoke-fines.

D is an air-chamber inclosed in brick-work and extending along one sideof the steamgenerator and in the rear thereof.

E are a series of hot-air flues communicating with the air-chamber D forconveying the hot air into the building.

F is the chin'mey-fluc, into which the products of combustion from thesteam-generator are discharged.

G is a smoke-flue conveying the products of combustion into the chimney.

ll are a series of smoke-fines, which convey the products of combustioninto the flue G.

I is a horizontal smoke-flue at the rear end of the steam-generator andcommunicating with the fines (l of the steam-generator and with thelines ll.

The tlues I and II. are made of metal and pass through the air-chamberD, whereby the gases of combustion passing through these ,tlues into thechimney are made to heat the air in the air-chamber.

J are one or more steam-coils, preferably arranged in vertical seriesabove the smoke $erial No. 281,807. (No model.)

flues H in the hot-air chamber D, and these steam-coils receive thesteam by means of supply-pipe K, which takes it from the top of thesteam-generator, and. is provided with a suitable valve or valves, L,near the front of 5 5 thesteam-generator to control the admission ofsteam into these coils. A return-pipe, M, carries the water ofcondensation from the steam-coils back into the steam-gei'ierator, asshown in Fig. 1.

The steam -pipe K may have a suitable branch pipe, K, for supplying anumber of radiators (not shown) with steam at the more distant portionsof the building.

The cold air is admitted, preferably, into the rear portion of theair-chamber D through a suitable opening or duct, 0, and from there itenters that portion of the air-chamber lying alongside thesteamgenerator. These two parts of the hot-air chamber are prefer- 7oably separated by an iron partition, P, with an iron door or damper, Q,in the lower portion thereof, through which the air is condueted intothe front portion of the hot-air flue, near the bottom thereof, so thatin its upward direction toward the inlet-openings B into the hot-airHues it has to pass through the interstices of the smoke-fines H and thesteam-coils J, becoming thereby thoroughly heated to readily ascend intothe hot-air fiue. These hot-air lines are provided, in addition to theopenings R, with the cold-air inlets S at the bottom and verticaldampers T T, connected in pairs by chains U. One pairfor each hot-airflue is made to close or open all or a portion of the cold and warm airinlets into the air-fines to form a mixture of cold and hot air of thedesired temperature. The chains U for each pair of dampers lead to thedifferent apartments to which the fines, respectively, carry the air topermit the occupant to control the temperature of the room at hisdesire, the lowering of the chains producing an increase of heat by theclosing of the cold-air line, while the raising of the chains U producesa decrease in temperature by cut ting off the access of the warm air andincreasing the admission of the cold air. Thus the temperature may becontrolled to a nicety from every room.

The cold air is first brought in contact with the heated flues I and II,which convey the gases of combustion into the chimney and then with thesteam-coils .1. By this arrangement no danger of burning the air, whichis so objectionable in air-heating, is produced, while at the same timea Very large quantity of air may be heated to a desirable tempen ture.The brick wall of the air-chamber being also partly exposed to the heatfrom the steam-generator, helps to temper the air and preventfluctuations.

What I claim as my invention is- 1. In a hot-air heating system, thecombination, with a steam-generator, of an air-heating chamber locatedin proximity thereto, a system of horizontal :fiues carrying theproducts of combustion from the generator through the lower portion ofsaid air-chamher, a system of steam-heating coils located in the upperportion of said air-chamber, one or more hot-air Iiues communicatingwith said air-chamber through inlets located near the top and bottom ofsaid air-chamber, respect- 25 ively, and a damper for each of saidopenings,

said dampers being connected in pairs to open or close said inlets intothe hot-air fines, substantially as described.

In a hot-air heating system, the combination of the steamgenerator A,provided with the smoke-line C, the smoke'flue I, communicatingtherewith, the ai1.'-chambcr l), located in rear and on one side of thesteamgenerator, the smoke-fines II, passing through the lower portion ofsaid air-chamber and communicating with the chimney, the steamcoils J,located in the upper portion of the air-chamber, the pipe K,communicating with the steam-generator and the steam-coils J, thereturn-pipe M to the generator, the hot-ai r fines E, having inlets Rand S, located, 1% spectively, near the top and bottom of theair-chamber, the dampers 'l and T, connected in pairs to close and openthe inlets into the air-flues, and the partition P, dividin theairchamber and provided with the damper Q and cold-air inlet 0,substantially as described.

In testimony whereof I aliix my signature, in presence of -twowitnesses, this filst day of May, 1888.

JOHN F. DURHAM.

Witnesses:

J As. WHITTEMORE, JOHN SCHUMAN.

